화학공학소재연구정보센터
Journal of Polymer Science Part A: Polymer Chemistry, Vol.38, No.13, 2333-2339, 2000
Polymerization of Higher Linear alpha-olefins with (CH3)(2)Si(2-methylbenz[e]indenyl)(2)ZrCl2
Poly-zeta-olefins ranging from poly-1-pentene to poly-1-octadecene with narrow polydispersities were synthesized with (CH3)(2)Si(2-methylbenz[e]indenyl)(2)ZrCl2 and methylaluminoxane at polymerization temperatures (T-p's) ranging from -15 to 180 degrees C and were characterized by gel permeation chromatography, NMR spectroscopy, and differential scanning calorimetry. The molar masses of the homopolymers obtained with (CH3)(2)Si(2-methylbenz[e]indenyl)(2)ZrCl2 were notably higher than those of poly-alpha-olefins synthesized with other zirconium-based metallocenes under similar conditions. The temperature dependence of the molar mass distribution of the poly-alpha-olefins can be described by a common exponential decay function regardless of the investigated monomer. At T-p's ranging from 20 to 100 degrees C, moderate isotacticity prevailed, but outside this temperature range, the polymers were less stereoregular.